Boosting OpacityEnhancement of Paints & Coatings with ChameleoBoostTM Technology

Omya Constructionomya.com

Have you transformed your formulation yet?

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Boosting Opacity with ChameleoBoost™ inspired by OmyaIn general terms, opacity can be described as the ability of a substance

or mixture to hide a substrate. A typical example would be a coating film

covering a given surface such as a wall. This simple phenomenon is actually the

result of a rather complex interplay of various components and parameters. In

industry, opacity is often referred to using other terms such as contrast ratio or

hiding power. Whatever term is used, the common functionality they describe

is the ability of an applied optical layer to hide what is underneath.

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ChameleoBoost™ by Omya offers a unique solution

for boosting opacity while optimizing formulation

cost. ChameleoBoost™ will either enhance coating

performance (e.g. opacity) at equal formulation cost

or reduce formulation cost (e.g. partial substitution of

titanium dioxide) while maintaining performance level of

the coating film. Any combination of the two is of course

possible as well.

Each of these factors have a direct impact on light

absorption and scattering. PVC level and film porosity

are particularly important when it comes to film opacity.

On one hand, coatings formulated at low PVC typically

exhibit high durability providing good weather and wet

scrub resistance, but high pigment levels are required to

achieve acceptable opacity performance. On the other

Simply put, opacity of a coating is high if the difference

between refractive index of the coating constituents is

large. In practice, this can be easily achieved by adding

white pigment such as titanium dioxide to a coating

formulation. The required amount of white pigment

for high opacity (sometimes referred to as coverage or

hiding efficiency) depends on the binder content, or more

precisely on the so-called pigment volume concentration

(PVC). Problem solved!

However, if we combine economic considerations with

technical knowhow, the way of formulating coating

materials might change significantly. In fact, the addition

of mineral fillers such as calcium carbonate products

can reduce formulation cost sharply, but typically have a

negative impact on optical performance such as opacity.

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Have you trans formed your formulation yet?

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Powder products:

Omyabrite®

Omyawhite®

Omyacarb® Extra

Calcigloss®

Omyacoat®

Omyaspace®

Slurry products:

Omyaflow®

Omyaspace®

Omyawhite®

Key factors influencing opacity of a coating film are:

· Amount and type of titanium dioxide

· Volume and type of mineral filler varying in composition, particle size and shape

· Pigment volume concentration

· Spreading rate

· Film porosity

hand, formulations with high PVC are usually less durable,

but require less pigment to reach good coverage due to

increased film porosity. In fact, entrapped air in the pores

of the coating film has a different optical density (or

refractive index) compared to mineral fillers, pigments and

binder, and thus increases the difference between refractive

indices. Furthermore, ultrafine mineral particles support

the even distribution and stabilization of single pigment

particles and provide an additional boost of opacity. The

latter phenomenon is called pigment spacing which leads

to more efficient light scattering by increasing particle

interface surface area compared to a situation where

pigment particles are agglomerated. ChameleoBoost™ by

Omya allows for the optimal adjustment of coating opacity

while keeping formulation cost to a minimum through the

use of qualified functional mineral offering consists of:

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ChameleoBoost™ inspired by Omya offers functional mineral fillers combined with formulation

expertise for a large application field covering the entire PVC range of decorative paints for matt

over semi-matt and semi-gloss to glossy paint systems.

ChameleoBoost™ inspired by Omya

ChameleoBoost™

Application recommendation

Omyacarb® Extra, Calcigloss®, Omyaspace®

Omyabrite®

Omyawhite®

Omyacarb® Extra, Omyacoat®,

Omyaspace®, Omyaflow®

Glossy

Semi-gloss

Semi-matt

Matt

100%

75%

50%

25%

PVC (%)

Spacing effect Dry hiding effect

0 20 40 60 80

Opacity

Development of opacity

without white pigments

MCC

PCC

UFGCC

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Development of dry and wet opacity of different CaCO3 without white pigments

100%

90%

80%

70%

60%

50%

40%

30%

20%

10%

0

Op

acit

y

Dry opacity UFGCC PCC MCC

35% 40% 45% 50% 55% 60% 65% 70% 75%

PVC

Wet opacity UFGCC PCC MCC

Carbon footprint

Price

Dry opacity

Wet opacity

Logistics Availability

Brightness

24

68

10

0

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ChameleoBoost™ TiO2

ChameleoBoost™ versus TiO2

In many cases, ChameleoBoost™

is used in combination with

high quality GCC fillers such as

Omyacarb® to balance additional

coating properties such as wet

scrub resistance, solids, rheology

and workability through optimized

particle packing.

Positioning

TiO2 8% 7% 6% 5% 4% 3% 2% 1% 0%

Omyabrite® 1300 X 10% 20%

Omyacarb® 5 33% 36% 27% 20%

Cost impact onto dry and wet opacity in emulsion paint at PVC 65% at different TiO2 levels

Op

acit

y

Opacity dry Opacity wet Costs

100%

90%

80%

70%

60%

50%

Co

sts

(Ref

eren

ce w

ith

8%

TiO

2 =

10

0)

-11%

-37%

-19%

100%

90%

80%

70%

60%

50%

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The use of Omya ChameleoBoost TM offers a series of benefits:

· Opacity boosting

· High brightness

· Enhanced TiO2 performance through spacing effect & pigment stabilization

· Formulation cost optimization (e.g. partial substitution of TiO2)

· Gloss control

· Reduced carbon footprint of coating formulation

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Product MatrixThe ChameleoBoost™ Technology offers a wide product portfolio for water- and solvent-based as well as powder

coatings. No matter where you demand boosting opacity, Omya supplies with smart logistics all over the world.

Production is located in our regions Americas (RAM), Asia-Pacific (RAP), Europe (REU) and Greater South & East (RSE).

ProductProduced

inMarket (Region) Technology

Delivery Form Decorative Industrial

Omyacarb® Extra Various REU, RSE UFGCC Powder ++ ++

Calcigloss® Various RSE, RAP UFGCC Powder ++ ++

Omyacoat® 420 Various REU, RSE, RAP UFGCC Powder ++ ++

Omyacoat® 850 France REU UFGCC Powder ++ ++

Omyacoat® 852 Finland REU, RSE UFGCC Powder ++ ++

Omyacoat® 855 Korea RAP UFGCC Powder ++ ++

Omyaspace® Various RAM UFGCC Powder ++ ++

Hakuenka® CCR-S Austria REU PCC Powder + +

Solvent based

ProductProduced

inMarket (Region) Technology

Delivery Form Gloss

Omyacarb® Extra Various REU, RSE UFGCC Powder ++

Calcigloss® Various RSE, RAP UFGCC Powder ++

Omyacoat® 420 Various REU, RSE, RAP UFGCC Powder +

Omyacoat® 852 Finland REU, RSE UFGCC Powder +

Omyacoat® 855 Korea RAP UFGCC Powder +

Omyaspace® Various RAM UFGCC Powder ++

Powder Coating

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ProductProduced

inMarket (Region) Technology

Delivery Form

Decorative

IndustrialGlossSemi- Gloss

Semi- Matt Matt

Omyacarb® Extra Various REU, RSE UFGCC Powder ++ ++ ++ + ++

Calcigloss® Various RSE, RAP UFGCC Powder ++ ++ ++ + ++

Omyacoat® 420 VariousREU, RSE,

RAPUFGCC Powder - + ++ ++ +

Omyacoat® 850 France REU UFGCC Powder - + ++ ++ -

Omyacoat® 852 Finland REU, RSE UFGCC Powder - + ++ ++ +

Omyacoat® 855 Korea RAP UFGCC Powder - + ++ ++ +

Omyaspace® Various RAM UFGCC Powder + ++ ++ ++ +

Omyaflow® 5 Various REU, RAM UFGCC Slurry + ++ ++ + +

Omyaflow® 6 Malaysia RAP UFGCC Slurry + ++ ++ + +

Omyaflow® 7 Various REU, RAM UFGCC Slurry + ++ ++ + +

Omyaflow® 8 Various REU, RSE UFGCC Slurry + ++ ++ + +

Omyaflow® 9 Various REU UFGCC Slurry - + ++ ++ +

Omyaflow® 10 VariousREU, RAM,

RAPUFGCC Slurry - + ++ ++ +

Omyaflow® 15 Various REU, RAP UFGCC Slurry - + ++ ++ +

Omyaflow® 16 Various REU, RAM UFGCC Slurry - + ++ ++ +

Omyaspace® Various RAM UFGCC Slurry + ++ ++ ++ +

Omyawhite® 18 Austria Global PCC Powder - - ++ ++ -

Omyawhite® 20 Austria Global PCC Powder - - ++ ++ -

Omyawhite® Plus Austria Global PCC Powder - - ++ ++ -

Hakuenka® CCR-S Austria REU PCC Powder ++ ++ - - +

Omyawhite® Plus Austria Global PCC Slurry - - ++ ++ -

Omyabrite® 1300 X France Global MCC Powder - - + ++ -

Water based

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+41 62 789 29 29

construction@omya.com

Omya International AG

CH-4665 Oftringen

www.omya.com

Omya Construction

Omya has taken every possible care to ensure that the information herein is correct in all aspects. However, Omya cannot be held responsible for any errors or omissions which may be found herein, nor will it accept responsibility for any use which may be of the information, the same having been given in good faith, but without legal responsibility. This information does not give rise to any warranties of any kind, expressed or implied, including fitness for purpose and non-infringement of intellectual property. The technical information presented comprises typical data and should not be taken as representing a specification. Omya reserves the right to change any of the data without notice.